Lock.



No. 737,479. PATENTED AUG. 25, 1903. I T. H. REA.

LOCK.

APPLICATION FILED JUNE 28. 1902.

N0 MODEL.

INVENTOI? flaw @912. Zea

ATTORNEYS.

Patented August 25, 1903.

PATENT OFFICE.

THOMAS H. REA, OF CAMBRIDGE, OHIO.

LOCK.

SPECIFICATION forming part of Letters Patent No. 737,479, dated August 25, 1903. Application filed June 28,1902. Serial No. 113,610. (No model.)

To aZZ whom z t may concern:

Be it known that LTHOMAS H. REA,a citizen of the United States, and a resident of Cam-.

bridge, in the county of Guernsey and State of Ohio, have invented a new and Improved Lock, of which the following is a full, clear, and exact description.

My invention relates to locks of the kind used upon doors, gates, 850.

My object more particularly is to produce a neat, simple, and efficient form of lock in which the weights of certain parts enter to poms extent as factors in the working of the ock.

Reference is to be had to the accompanying drawings, forming a partof this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is an elevationof the lock with the front plate removed and showing the bolts thrown inward. Fig. 2 is a somewhat similar View, but showing the bolts thrown outward. Fig. 3 is a vertical section upon the line 3 3 of Fig. 2 looking in the direction of the arrow. Fig. 4 is a perspective view of the yoke for actuating certain movable parts, and Fig. 5 is a perspective view of a bearing provided with arms for actuating the yoke.

The hollow casing 1 is provided with screwholes 2 3 4 in the usual manner. Movably mounted within the hollow casing is a latchbolt 5, pivoted at 6 upon the lower corner of a segment 7, provided with a weight 8, this segment being pivoted at 9 and free to rock. A lug 10 is rigidly mounted upon the segment and serves as a limiting-stop for the same. The segment is provided with an eye 11,which engages a leaf-spring 12,'this spring being partially bent around a roller 12? and being of such strength as barely to overcome the friction of certain moving parts,as hereinafter-explained. The lower or free end of the spring 12 engages a roller 13, which affords a hearing therefor.

A yoke 14 is connected by a pivot 15 with the segment 7. Upon the upper end of this yoke is a bridge 16, provided with contactsurfaces 16, these surfaces being somewhat rounded, as indicated more particularly in Figs. 1 and 4. A shaft 17 is provided, having a hub 17, (shown more particularly in Fig. 5,) this hub being rigidly secured upon the shaft and free to rock therewith. The hub is provided with a slot 17 of the shape indicated more particularly in Fig. 5 and with arms 18 19, the upper surfaces of which are free to engage the curved surfaces 16 of the bridge. The knob consists of a hub 20 and an egg-shaped member 21, integrally connected therewith, the lower end of this member being of such conformity that the knob in effect depends from the shaft 17. The object of this arrangement is that the weight of the knob may normally hold the shaft 17 in a predetermined position-to wit, the position indicated in Fig. 2whereas if the knob be turned either clockwise or counter-clockwise by the hand the arm 18 or the arm 19 will engage one of the surfaces 16, thereby raising the yoke 14 and causing the segment 7 to rock, thus throwing the latchbolt 5 out or in, as the case may be.

Upon a pivot 22 is mounted a detent 23, provided with a boss 24,which extends through a slot in the casing 1. The detent 23 may be rocked into different positions, as may be seen by comparing Fig. 1 and Fig. 2. The idea is the detent 23 allows the lug 10 to pass downward and to the left into the position indicated in Fig. 2, but does not allow it to pass back into the position which it occupies in Fig. 1 until the boss 24 is tripped by the hand of the operative.

The object in weakening the leaf-spring 12 is to enable this spring to barely overcome the friction of the pivots 6 and 15, together with the friction between the surfaces 16 and the upper surfaces of the arms 18 19. In

other words, the normal working of the chain of mechanism consisting of the latch-bolt, the rocking segment, and the yoke generates more or less friction, and the spring 12 is so tensioned as to barely overcome this friction,

thereby allowing the weight of the knob 21 to assert itself upon the arms 18 19 and also enabling the weight of the yoke 14 and of the segment 7 to throw the latch-bolt into the position indicated in Fig. 2.

The keyhole 26 is of the usual pattern.

The main bolt 27 is provided with a boss 28, which is normally engaged by a lug 29 within an aperture 30 in the plate 34. The bolt is provided with shoulders 31 32 33. The shoulder 31 serves as a limiting-stop,

whereas the shoulders 32 and 33 serve as bearing surfaces and are engaged by the key when the bolt'is thrown in or out. The plate 34 is provided with a bearing 35, which is engaged by a leaf-spring 36 and supported thereon in such manner as to be movable radially upwardthat is to say, when the key is inserted through the keyhole 26 it moves the plate 34 upwardand in so doing engages one or the other of the shoulders 32 33. The plate 34 may be provided with a shoulder 39 so as to prevent the entrance of false keys. The main bolt is also provided with a slot 36 and a recess 38, the former serving as a guide for maintaining itin apredetermined plane, the latter being engaged by a lug 37 and acting as a limiting-stop, as indicated more particularly in Fig. 2.

The operation of my device is quite simple.-

If the main bolt 27 .is to be thrown by the key, the key is merely inserted through the keyhole and turned to the right or the left, as the case may be, in the usual manner. Independently of the action of the key, however, the door is normally locked by means of the latch-bolt 5, this bolt being actuated by the Weight of the chain of mechanism above described, the weight thereof being entirely free to assert itself, for the reason that the friction of the several moving parts is elfectually relieved by the tension of the spring 12, as above explained.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A lock, comprising a hollow casing, a

' weighted'segment pivotally mounted therein,

a movable latch-bolt disposed within said casing and pivoted to said segment, a sliding yoke pivotally connected with said segment, a rocking member provided with arms for engaging said yoke, a pendent knob rigidly mounted upon said rocking member, the ar rangement being such that the weight of said pendent knob tends to maintain the said rocking member in a predetermined normal position and the weight of said segment tends to maintain said bolt in a predetermined normal position, and a spring connected with said segment, said spring being of a definite strength commensurate with the combined friction of said latch-bolt, segment and yoke. 2. In a lock, the combination with a knobspindle,of a freely-sliding yoke through which the knob-spindle extends, means for operating the yoke from the spindle, a latch-bolt and a weighted and spring-pressed pivoted segment to opposite portions of which the latch-bolt and the yoke are pivoted.

3. In a lock, the combination with a knobspindle, and a sliding yoke operated by the knob-spindle, of a latch-bolt, a pivoted and weighted segment, pivoted to the inner end of the bolt and to the lower end of the yoke, and a locking device engaging the segment to lock it in position, as set forth.

4. In a lock, the combination with a knobspindle, and a sliding yoke operated by the knob-spindle, of a latch-bolt, a pivoted and weighted segment pivoted to the inner end of the bolt and to the lower end of the yoke, said segment being provided with a lug, and a pivoted detent adapted to engage the lug of the segment to lock it in position, as set forth.

5. In a lock, the combination of a casing, a knob-spindle, a pendent knob on the end of the spindle, a freely-sliding yoke through which the knob-spindle extends, means for operating the yoke from the spindle, a sliding latch-bolt, a pivoted and weighted segment to opposite portions of which the latchbolt and yoke are pivoted, said segment being provided With a lug, a spring acting upon the segment, and a pivoted detent adapted to engage the lug of the segment and provided with a boss projecting out through the casing, as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' THOMAS H. REA.

Witnesses:

THdMAs SMITH, ELMER E. BOND. 

